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Subject: Re: ipod Ogg battery life

Re: ipod Ogg battery life

From: John Sheahan <jrsheahan_at_optushome.com.au>
Date: Sun, 30 Aug 2009 11:27:51 +1000

Most of my music is ogg, however.
>>
>> That tends to draw a similar current (perhaps a ma more) most of the
>> time, but spikes to 118ma for about 330ms every (about) 2.6 seconds.
>
>> Any clues as to what the decoder could be doing here?
>
> Probably boosting the CPU speed (Vorbis is a tad more CPU intensive
> than MP3). Take a look at what's going on with the buffering thread
> under "debug."
> -
Thanks
I just twigged that 'debug' was a menu option not a mailing list thread :(
you are right, the cpu is bouncing to 80MHz from 30 for a while.

Investigating further, the release 3.3 ogg decoder has issues. It is
significantly more efficient,
than 3.2, but 3.3 to current dies with data aborts on many of my audiobooks.
Typically 48KHz compressed ones.

I see this bug has been reported. The charging current on both usb and
plugpack
for the mini looks odd too, does not even charge with backlight or
spooling the file.

Seems that 3.2 and mp3's might be the go for now.

regards, john
 
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Received on 2009-08-30


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